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Gain of an amplifier usually expressed in db because _______________

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Gain of an amplifier usually expressed in db because _______________

(a) It is a small unit

(b) Calculations become easy

(c) Human ear response is logarithmic

(d) Gain is reduced

I had been asked this question in exam.

Origin of the question is Multistage Amplifier topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct choice is (c) Human ear response is logarithmic

The best explanation: The human hearing scale is logarithmic in nature. For doubling perceived intensity of sound, the sound power must be increased by 10 times. That means the gain of amplifier which controls sound intensity must have gain of 10 for doubling perceived intensity of sound which is in a bell and in 10 decibel scale.

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